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Graduate Student Seminar - 11/06/2015

"Universal Physics in Zonal Flows, Nonlinear Landau Damping and Hydrodynamics"

by Wrick Sengupta

Friday, November 6, 2015 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Professor Adil Hassam

In a modern magnetic confinement device like tokamak and stellarator, zonal flows play an important role in determining the transport and confinement of plasmas. To understand zonal flows in a collisionless system, it is important to understand the dynamics of particles trapped because of magnetic inhomogeneities. In this talk, we'll show how in a large aspect ratio tokamak, certain aspects of the trapped particle dynamics are completely equivalent to a forced nonlinear pendulum. Interestingly, we'll show that the same physics shows up in a different plasma system: Nonlinear Landau damping of plasma waves. In fact, we give three criteria which, if satisfied in any system, should have the same physical features. Finally, we show that the universality in physics is because of a deep connection between Hamiltonian dynamics and hydrodynamics.

For additional information about the IREAP Graduate Student Seminars, contact Peter Megson.

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